How to Security Officer 202?

[Frank_Stein]

OK, rather than further comment on Grim Sleeper, how about I post the one I've been using:

"Hello, crew member. You are being detained as part of an ongoing investigation. While you are not necessarily suspected of a crime, your compliance is still required. You will be scanned for forensic evidence and your belongings will be searched. While this happens, you are invited, but not required, to explain your recent actions in as much detail as you feel necessary. Compliance will ensure a prompt release after the search is completed. Resistance will lead to brig time."

This right here is how you Security.

In response to the scenario Grim laid out:

Radio informs you of a suspicious character (or you see somebody being shifty).

If it's over the radio, ask follow up questions to the person reporting it, preferably through private means (PDA or in person) It's important to have all the details so you know what to look for when getting the evidence.
If you see it in person, use your judgement of what they could be doing and what kinda reaction it warrants. Breaking into the Chaplains office probably doesn't require an immediate tasing. The armory is a different case.

But, being the supercop you are, you gain the upper hand, and put the cuffs on him.
What now?
Do you read this guy his rights, and patch him back to full health, while he activates his freedom-implant?
Or put him in the big brig for a full minute, while the opens up the secret door he build earlier?
Let's face it, between the adrenaline and the obvious problem that this guy is, you take him out!

At this point, you're not acting on what happened or is happening, but what could happen. 
By all means take the precautions that you need to to protect the station and yourself, but don't punish people for things they haven't done yet. It's one thing to kill someone in the heat of a firefight, but if you've got the situation under your control then kill them you're doing wrong imo.